[evince] unarr: Fix build on s390x

[Bastien Nocera <hadess src gnome org>]

commit 0e700196e883c1d6d7b2fdc252c74cde7087dbe9
Author: Florian Weimer <fweimer redhat com>
Date:   Mon Jul 31 14:46:49 2017 +0200

    unarr: Fix build on s390x
    
    On some big-endian arches (where MY_CPU_NAME doesn't get set),
    there is a preprocessor syntax error. It results in build failures
    like this:
    
    In file included from rar/../lzmasdk/Ppmd.h:8:0,
                     from rar/../lzmasdk/Ppmd7.h:12,
                     from rar/rar.h:10,
                     from rar/rar.c:4:
    rar/../lzmasdk/CpuArch.h:177:18: error: #elif with no expression
       #elif MY_CPU_BE
                      ^
    In file included from rar/../lzmasdk/Ppmd.h:8:0,
                     from rar/../lzmasdk/Ppmd7.h:12,
                     from rar/rar.h:10,
                     from rar/uncompress-rar.c:7:
    rar/../lzmasdk/CpuArch.h:177:18: error: #elif with no expression
       #elif MY_CPU_BE
                      ^
    
    With help from Iain Lane <iain orangesquash org uk>
    
    See https://sourceforge.net/p/sevenzip/patches/317/
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787248

 cut-n-paste/unarr/lzmasdk/CpuArch.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/cut-n-paste/unarr/lzmasdk/CpuArch.h b/cut-n-paste/unarr/lzmasdk/CpuArch.h
index afb6b67..e26bc78 100644
--- a/cut-n-paste/unarr/lzmasdk/CpuArch.h
+++ b/cut-n-paste/unarr/lzmasdk/CpuArch.h
@@ -174,7 +174,7 @@ MY_CPU_LE_UNALIGN means that CPU is LITTLE ENDIAN and CPU supports unaligned mem
 #ifndef MY_CPU_NAME
   #ifdef MY_CPU_LE
     #define MY_CPU_NAME "LE"
-  #elif MY_CPU_BE
+  #elif defined (MY_CPU_BE)
     #define MY_CPU_NAME "BE"
   #else
     /*